Originally Posted by Europa
You don't need to erase all content and settings. Just delete all of your email accounts from the phone and set them back up again. When it asks you if you want to keep the old contacts (or something like that, I can't remember exactly how it's worded) click no. When it syncs afterwards, it will only sync one set of contacts on.
Yes. Do this.
Why the hell would you erase all contents and settings? WTF? That takes a SOLID 2 hours. Try the simple, smart solution first, people.